More information about placement on transparent blocks can be found at Opacity/Placement.

Activation

Buttons are usually in an inactive state, but can be temporarily activated by players. A button can be activated by using it. A wooden button can also be activated by a fired arrow if it is stuck in the same face of a block as the button.[1]

Whenever activated, a wooden button will remain active for 15 redstone ticks (1.5 seconds, barring lag), while a stone button will remain active for 10 redstone ticks (1 second, barring lag). A wooden button having been activated by a fired arrow will remain active until the arrow despawns (after one minute) or is picked up by a player.

When a button changes state it will provide a redstone update to all redstone components adjacent to itself (including above and below), and to all redstone components adjacent to its attachment block.

A button's type is defined by its ID name, and its orientation and activation status is stored in its block data. A button also has a block state which is expected to replace the functionality of block data in a future version.

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